package com.szcmcc.movie.view;

import android.content.Context;
import android.graphics.Camera;
import android.graphics.Matrix;
import android.util.AttributeSet;
import android.util.Log;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.Transformation;
import android.widget.Gallery;
import android.widget.ImageView;

public class GalleryFlow extends Gallery {
    private Camera mCamera = new Camera();//相机类
    private int mMaxRotationAngle = 0;//最大转动角度
    private int mMaxZoom = 0;////最大缩放值
    private int mCoveflowCenter;//半径值
    public GalleryFlow(Context context) {
        super(context);
        //支持转换 ,执行getChildStaticTransformation方法
        this.setStaticTransformationsEnabled(true);
    }
    public GalleryFlow(Context context, AttributeSet attrs) {
        super(context, attrs);
        this.setStaticTransformationsEnabled(true);
    }
    public GalleryFlow(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        this.setStaticTransformationsEnabled(true);
    }
    public int getMaxRotationAngle() {
        return mMaxRotationAngle;
    }
    public void setMaxRotationAngle(int maxRotationAngle) {
        mMaxRotationAngle = maxRotationAngle;
    }
    public int getMaxZoom() {
        return mMaxZoom;
    }
    public void setMaxZoom(int maxZoom) {
        mMaxZoom = maxZoom;
    }
    private int getCenterOfCoverflow() {
        return (getWidth() - getPaddingLeft() - getPaddingRight()) / 2
                        + getPaddingLeft();
    }
    private static int getCenterOfView(View view) {
        System.out.println("view left :"+view.getLeft());
        System.out.println("view width :"+view.getWidth());
        return view.getLeft() + view.getWidth() / 2;
    }
    private boolean isScrollingLeft(MotionEvent e1, MotionEvent e2)
    {   
     return e2.getX() > e1.getX(); 
    }
    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
      float velocityY) {
//    	 int kEvent;  
//    	  if(isScrollingLeft(e1, e2)){ 
//    	   //Check if scrolling left     
//    	   kEvent = KeyEvent.KEYCODE_DPAD_LEFT;  
//    	   }  else{ 
//    	    //Otherwise scrolling right    
//    	    kEvent = KeyEvent.KEYCODE_DPAD_RIGHT;   
//    	    }  
//    	  onKeyDown(kEvent, null);  
//    	  return true;  
    	  return false;

    }

    
    
   //控制gallery中每个图片的旋转(重写的gallery中方法)
//    protected boolean getChildStaticTransformation(View child, Transformation t) {  
//        //取得当前子view的半径值
//        final int childCenter = getCenterOfView(child);
//        System.out.println("childCenter："+childCenter);
//        final int childWidth = child.getWidth();
//        //旋转角度
//        int rotationAngle = 0;
//        //重置转换状态
//        t.clear();
//        //设置转换类型
//        t.setTransformationType(Transformation.TYPE_MATRIX);
//        //如果图片位于中心位置不需要进行旋转
//        if (childCenter == mCoveflowCenter) {
//            transformImageBitmap((ImageViewTouch) child, t, 0);
//        } else {
//            //根据图片在gallery中的位置来计算图片的旋转角度
//            rotationAngle = (int) (((float) (mCoveflowCenter - childCenter) / childWidth) * mMaxRotationAngle);
//            System.out.println("rotationAngle:" +rotationAngle);
//            //如果旋转角度绝对值大于最大旋转角度返回（-mMaxRotationAngle或mMaxRotationAngle;）
//            if (Math.abs(rotationAngle) > mMaxRotationAngle) {
//                rotationAngle = (rotationAngle < 0) ? -mMaxRotationAngle : mMaxRotationAngle;
//            }
//            transformImageBitmap((ImageViewTouch) child, t, rotationAngle);
//        }
//        return true;
//    }
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        mCoveflowCenter = getCenterOfCoverflow();
        super.onSizeChanged(w, h, oldw, oldh);
    }
    private void transformImageBitmap(ImageView child, Transformation t,
                    int rotationAngle) {
        //对效果进行保存
        mCamera.save();
        final Matrix imageMatrix = t.getMatrix();
        //图片高度
        final int imageHeight = child.getLayoutParams().height;
        //图片宽度
        final int imageWidth = child.getLayoutParams().width;
        
        //返回旋转角度的绝对值
        final int rotation = Math.abs(rotationAngle);
        
        // 在Z轴上正向移动camera的视角，实际效果为放大图片。
        // 如果在Y轴上移动，则图片上下移动；X轴上对应图片左右移动。
        mCamera.translate(0.0f, 0.0f, 100.0f);
        // As the angle of the view gets less, zoom in
        if (rotation < mMaxRotationAngle) {
            float zoomAmount = (float) (mMaxZoom + (rotation * 1.5));
            mCamera.translate(0.0f, 0.0f, zoomAmount);
        }
        // 在Y轴上旋转，对应图片竖向向里翻转。
        // 如果在X轴上旋转，则对应图片横向向里翻转。
        Log.i("xx", child.toString()+rotationAngle+"-----rotationAngle");
        mCamera.rotateY(rotationAngle);
        mCamera.getMatrix(imageMatrix);
        imageMatrix.preTranslate(-(imageWidth / 2), -(imageHeight / 2));
        imageMatrix.postTranslate((imageWidth / 2), (imageHeight / 2));
        mCamera.restore();
    }
}
